Lol, they use there magic powers to make Star Wars (better than Star Wars actually) Holographic Reporter, why?
Because they can!
They really have no real reason for this, nor does it serve any purpose other than to get people's attention lol.
Those CNN folks crack me up
[edit to add]
On second thought, this doesn't look like a hologram to me anymore, it looks more like an alpha transparent composite, in other words "green
screen".
First they brought in those touch screens, then the live debate feedback, and now they're beaming in freaking Emperor Palpatine. I think this is a
sure sign that CNN has too much money.
Today on Situation Room they explained how they did it. They guy still refers to it as a "hologram" but said it was done with a green room or
green screen background.
Yep the only part that is flattering is the ability to overcome the subsequent lag from the client/server side communication. I guess it would require
cueing of some sort. Maybe each has a clicker to indicate the end of their question/answer that is broadcast serparately like a "tape synch"
mechanism on studio midi & recording equipment. There has to be a conductor.
The need for 40 HD cameras is a bit excessive though. I figure no more than 8 and a renderer to estimate & render the differential image. My opinion
is that this could be done just as well with even 6 cameras as its only the front half that is of concern. One of the first rules in theater is to
avoid turning your back to the audience.